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ÌâÄ¿1£ºPrediction of VLF ELectric Strength Based on Waveguide Mode Theory Using GA


Accession number:  20112714121329

DOI:  10.1109/ICEICE.2011.5777643
Accession number:  20112714121329

Title:  Prediction of VLF electric strength based on waveguide mode theory using GA

Authors:  Wang, Qin1 ; Liu, Chao1 ; Huang, Jinquan1  

Author affiliation:  1  Institute of Electrical Engineering, Navy University of Engineering, Jie-Fang-Da-Dao 717, Wuhan 430033, China


Corresponding author:  Wang, Q. (wqin_922@sina.com)  

Source title:  2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings

Abbreviated source title:  Int. Conf. Electr. Inf. Control Eng., ICEICE - Proc.

Monograph title:  2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings

Issue date:  2011

Publication year:  2011

Pages:  605-608

Article number:  5777643

Language:  English

ISBN-13:  9781424480395

Document type:  Conference article (CA)

Conference name:  2011 International Conference on Electric Information and Control Engineering, ICEICE 2011

Conference date:  April 15, 2011 - April 17, 2011

Conference location:  Wuhan, China

Conference code:  85257

Sponsor:  IEEE Beijing Section ED Chapter; Jiangsu University

Publisher:  IEEE Computer Society, 445 Hoes Lane - P.O.Box 1331, Piscataway, NJ 08855-1331, United States

Abstract:  An equation which describes the propagation of the very low frequency(VLF) electromagnetic waves in the earth-ionosphere waveguide is created based on waveguide mode theory. The eigenvalues of the equation i.e. the complex angles of wave incidence is obtained by genetic algorithm(GA). Then the electromagnetic fields in the waveguide are calculated. For perfectly conducting earth and perfectly reflecting ionosphere there is a gap between the numerical method of GA and the analytical method especially for higher modes. The simulation trails show that the GA method has a higher accuracy than the analytical method within 1000km where the minimum field strength appears in the distance of about 500km from transmitter. The fields calculated from it have a closer approximation to the actual data so it can be used to predict the field strength of VLF waves in the propagation if the influence of atmospheric noise is not considered. © 2011 IEEE.

Number of references:  10

Main heading:  Waveguides

Controlled terms:  Atmospherics  -  Eigenvalues and eigenfunctions  -  Electromagnetic fields  -  Electromagnetic waves  -  Genetic algorithms  -  Ionosphere  -  Ionospheric measurement  -  Numerical methods

Uncontrolled terms:  Analytical method  -  Atmospheric noise  -  Complex angle  -  Earth ionosphere waveguide  -  earth-ionosphere  -  Eigenvalues  -  Electric strength  -  Field strengths  -  Higher mode  -  Very low frequency   -  VLF  -  Wave incidence  -  Waveguide mode  -  waveguide model

Classification code:  921 Mathematics  -  723 Computer Software, Data Handling and Applications  -  714.3 Waveguides  -  711.1 Electromagnetic Waves in Different Media  -  711 Electromagnetic Waves  -  701.1 Electricity: Basic Concepts and Phenomena  -  701 Electricity and Magnetism

DOI:  10.1109/ICEICE.2011.5777643

Database:  Compendex
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ÌâÄ¿2£ºNumerical Research of Bowtie Sierpinski Fractal Patch Antenna in RFID


Accession number:  20111513907154
ISBN-13:  9781424457052
DOI:  10.1109/ICMMT.2010.5524789




Accession number:  20111513907154

Title:  Numerical research of bowtie Sierpinski fractal patch antenna in RFID

Authors:  Wang, Qin1 ; Huang, Jinquan1  

Author affiliation:  1  Institute of Electrical Engineering, Navy University of Engineering, Jie-Fang-Da-Dao 717, Wuhan, 430033, China


Corresponding author:  Wang, Q.

Source title:  2010 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2010

Abbreviated source title:  Int. Conf. Microw. Millimeter Wave Technol., ICMMT

Monograph title:  2010 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2010

Issue date:  2010

Publication year:  2010

Pages:  1348-1351

Article number:  5524789

Language:  English

ISBN-13:  9781424457052

Document type:  Conference article (CA)

Conference name:  2010 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2010

Conference date:  May 8, 2010 - May 11, 2010

Conference location:  Chengdu, China

Conference code:  84511

Publisher:  IEEE Computer Society, 445 Hoes Lane - P.O.Box 1331, Piscataway, NJ 08855-1331, United States

Abstract:  A Method of Moment (MoM) model is built by RWG (Rao-Wilton-Glisson) vector basis function which is suit both for lines and surfaces. Use this model the surface currents in a Sierpinski fractal patch antenna in RFID are calculated and the radiated performances are obtained when flare angle is 30¡ã, 60¡ã and 90¡ã respectively. Results show that currents flow mainly along edges of triangles and the antenna behaviors a multi-band characteristic. When flare angle becomes broader firstly the resonant frequencies move towards the lower band which means that narrower flare angle benefits to antenna miniaturization; secondly the input impedance level becomes smoother and the minimum reflected coefficient becomes smaller and moves to higher resonant frequencies which means that broader flare angle benefits to radiation in higher frequencies; last the radiation pattern becomes more similar between each other. In brief variation in the flare angle brings about contradiction between miniaturization and radiation ability of the antenna. A compromise between mechanical property and electric performance should be adopted in antenna applications. © 2010 IEEE.

Number of references:  11

Main heading:  Directional patterns (antenna)

Controlled terms:  Cryptography  -  Electric impedance  -  Fractals  -  Mechanical properties  -  Method of moments  -  Microstrip antennas  -  Millimeter wave devices  -  Millimeter waves  -  Miniature instruments  -  Natural frequencies

Uncontrolled terms:  Antenna applications  -  Antenna behavior  -  Antenna miniaturization  -  Basis functions  -  Bow tie  -  Flare angle  -  Higher frequencies  -  Input impedance  -  Multiband  -  Numerical research   -  Radiation patterns  -  Rao-wilton-glisson  -  Resonant frequencies  -  Sierpinski fractals  -  Surface current

Classification code:  944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments  -  943 Mechanical and Miscellaneous Measuring Instruments  -  942 Electric and Electronic Measuring Instruments  -  941 Acoustical and Optical Measuring Instruments  -  921 Mathematics  -  951 Materials Science  -  716 Telecommunication; Radar, Radio and Television  -  714 Electronic Components and Tubes  -  711.1 Electromagnetic Waves in Different Media  -  711 Electromagnetic Waves  -  701.1 Electricity: Basic Concepts and Phenomena  -  715 Electronic Equipment, General Purpose and Industrial

DOI:  10.1109/ICMMT.2010.5524789

Database:  Compendex
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Prediction of VLF ELectric Strength Based on
Waveguide Mode Theory Using GA


Accession number:  20112714121329  £¨Ò²¾ÍÊÇËùνµÄEIºÅ£©


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Numerical Research of Bowtie Sierpinski
Fractal Patch Antenna in RFID


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